I would say that you can refill/top off yourself. Just get one of the kits that have the gauge on the fill tube. It is pretty easy to do.
That being said, if you are low, you have a leak in a line or connection somewhere. Dealer can put a dye in the lines and find the leak with UV light. Then they will fix the problem. But if it is a very slow leak, I'd just refill myself. Just depends on how often you have to top it off.
Also, it is much better to use a full set of actual A/C gauges to fill. You can get the exact correct pressure that way. You need to adjust the pressure in the system depending on the ambient temp when you are filling. The gauges in the kits just give you a range.
You can get a set of full gauges at Harbor Freight for around $50. No, they are not really nice gauge sets, but they will work for the few times most of us will use them in our driveway.
Good Luck
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2007 Light Khaki 4x2 Sport
- Debadged - LTT CAI with Amsoil Filter - JVC HD Radio - Infinity BassLink
- Iggee Seat Covers - Black Moabs - 265/75-16 Cooper Discoverer ATP - 4.10's
- DIY Franky sitting at 23.75" - Al's 4.5 UCAs - Trimmed F&R Bumpers
- Removed Rear Sway Bar - Removed Rear Vibration Damper
- 75k miles so far...
